From: Chris Metcalf <cmetcalf@ezchip.com>
Date: Tue, 8 Sep 2015 22:02:12 +0000 (-0700)
Subject: bootmem: avoid freeing to bootmem after bootmem is done
X-Git-Tag: omap-for-v4.3/fixes-rc1~54^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b4ace4141db1ddc46f6c9915086dd5e18d7154d;p=pandora-kernel.git

bootmem: avoid freeing to bootmem after bootmem is done

Bootmem isn't popular any more, but some architectures still use it, and
freeing to bootmem after calling free_all_bootmem_core() can end up
scribbling over random memory.  Instead, make sure the kernel generates
a warning in this case by ensuring the node_bootmem_map field is
non-NULL when are freeing or marking bootmem.

An instance of this bug was just fixed in the tile architecture ("tile:
use free_bootmem_late() for initrd") and catching this case more widely
seems like a good thing.

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Paul McQuade <paulmcquad@gmail.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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